I’m using pyroot on lxplus7 to try to draw a stack plot with the corresponding total error shown for each bin in the plot. I’m following the plotting instructions here http://ipnp.cz/scheirich/?page_id=277. My problem is that when I specify "drawOpt = “E2” ", the errors don’t show up. However, when I specify "drawOpt = “E1” ", the errors show up as lines on the stack plot. I want to show the errors as boxes filled with pattern 3345. I don’t understand why I can plot the errors for the E1 option, but not for the E2 option.